需要从 ValidationBaseClass 公开 HasError 属性以查看具有流畅验证的模型

Question

我需要帮助在 SfTextInputLayout 中使用 SfTextBoxEx 实现 INotifyDataErrorInfo 接口。

WPF 与 MVVM 使用 Caliburn.Micro 框架。

请找到以下项目结构以了解问题。

1) 文件夹名称：基础设施文件：ValidatedPropertyChangedBase.cs

--它包含 INotifyDataErrorInfo 的实现。

2) 文件夹名称：型号文件：TestModel.cs --包含两个继承自 ValidatedPropertyChangedBase 的属性 --还包含 class 用于使用 FluentValidation

验证属性

4) 文件夹名称：视图文件：HomeView.xaml --标准 window 有两个 SfTextInputLayout 和 SfTextBoxExt

4) 文件夹名称：ViewModel 文件：HomeViewModel.cs --standard view model with Model as 属性 with Validation triggering. -- 在这里，如果我在验证方法上放置断点，我可以看到返回的错误是正确的，但不知何故它不会触发 UI 来显示错误消息。 --我已经在将属性与文本框绑定时设置了 ValidatesOnNotifyDataError=true。

如有不妥请各位指点指点。注意：我正在使用 syncfusion 控件，但我也尝试使用标准文本框，它没有触发 errorchanged 事件。

我还使用了 IntoifyDataError 实现，来自：https://www.thetechgrandma.com/2017/05/wpf-prism-inotifydataerrorinfo-and.html

--ValidatedPropertyChangedBase

public abstract class ValidatedPropertyChangedBase : PropertyChangedBase, INotifyDataErrorInfo
{
    private readonly Dictionary<string, List<string>> _errors = new Dictionary<string, List<string>>();

    


    public void SetError(string propertyName, string errorMessage)
    {
        if (!_errors.ContainsKey(propertyName))
            _errors.Add(propertyName, new List<string> { errorMessage });

        RaiseErrorsChanged(propertyName);
    }

    protected void ClearError(string propertyName)
    {
        if (_errors.ContainsKey(propertyName))
            _errors.Remove(propertyName);

        RaiseErrorsChanged(propertyName);
    }

    protected void ClearAllErrors()
    {
        var errors = _errors.Select(error => error.Key).ToList();

        foreach (var propertyName in errors)
            ClearError(propertyName);
    }
    public void RaiseErrorsChanged(string propertyName)
    {
        ErrorsChanged(this, new DataErrorsChangedEventArgs(propertyName));
    }

    public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged = delegate { return; };


    public bool HasErrors
    {
        get { return _errors.Any(x => x.Value != null && x.Value.Count > 0); }
    }
    public IEnumerable GetErrors(string propertyName)
    {
        if (String.IsNullOrEmpty(propertyName) ||
           !_errors.ContainsKey(propertyName)) return null;
        return _errors[propertyName];
    }

}

--ViewModel

public class HomeViewModel : ValidatedPropertyChangedBase
{

    private TestModel _model;
    public TestModel Model
    {
        get { return _model; }
        set
        {
            if (_model != value)
            {
                _model = value;
                NotifyOfPropertyChange(() => Model);
            }
        }
    }

    public HomeViewModel()
    {
        Model = new TestModel();
    }

    public void ValidateData()
    {
        ClearAllErrors();
        var validator = new TestModelValidation();
        FluentValidation.Results.ValidationResult result = validator.Validate(Model);
        foreach (var error in result.Errors)
        {
            SetError(error.PropertyName, error.ErrorMessage);
        }

        if (result.IsValid)
        {
            MessageBox.Show("Data good to save !");
        }

    }
}

--查看

<Window
x:Class="ValidationDemo.Views.HomeView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:convertor="clr-namespace:ValidationDemo.Infrastructure"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:ValidationDemo.Views"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:sf="http://schemas.syncfusion.com/wpf"
Title="HomeView"
Width="800"
Height="450"
mc:Ignorable="d">
<Window.Resources>
    <Style
        TargetType="sf:SfTextInputLayout">
        <Setter Property="Width" Value="200" />
    </Style>
</Window.Resources>
<StackPanel
    HorizontalAlignment="Center"
    VerticalAlignment="Center"
    Orientation="Vertical">
    <sf:SfTextInputLayout
        Hint="First Name">
        <sf:SfTextBoxExt
            Text="{Binding Path=Model.FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnNotifyDataErrors=True}" />
    </sf:SfTextInputLayout>
    <sf:SfTextInputLayout
        Hint="Last Name">
        <sf:SfTextBoxExt
            Text="{Binding Path=Model.FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnNotifyDataErrors=True}" />
    </sf:SfTextInputLayout>
    <TextBox
            Text="{Binding Path=Model.FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnNotifyDataErrors=True}" />
    <TextBox
            Text="{Binding Path=Model.FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnNotifyDataErrors=True}" />
    <Button
        x:Name="ValidateData"
        Content="Validate Data" />
</StackPanel>

--实施 Fluent 验证的模型：

public class TestModel : ValidatedPropertyChangedBase
{

    private string _firstName;
    public string FirstName
    {
        get { return _firstName; }
        set
        {
            if (_firstName != value)
            {
                _firstName = value;
                NotifyOfPropertyChange(() => FirstName);
            }
        }
    }

    private string _lastName;
    public string LastName
    {
        get { return _lastName; }
        set
        {
            if (_lastName != value)
            {
                _lastName = value;
                NotifyOfPropertyChange(() => LastName);
            }
        }
    }
}

public class TestModelValidation:AbstractValidator<TestModel>
{
    public TestModelValidation()
    {
        RuleFor(t => t.FirstName)
            .NotEmpty()
            .WithMessage("Please enter first name");

        RuleFor(t => t.FirstName)
            .NotEmpty()
            .WithMessage("Please enter last name");
    }
}

Answer 1

能够找出问题，是通过控制从视图模型中公开 HasError。

ErrorText="{Binding RelativeSource={RelativeSource Mode=Self}, Path=InputView.(Validation.Errors), Converter={StaticResource EC}}"
        HasError="{Binding RelativeSource={RelativeSource Mode=Self}, Path=InputView.(Validation.Errors), Converter={StaticResource ECO}}"

在带有转换器的控件上添加了属性并解决了问题。

需要从 ValidationBaseClass 公开 HasError 属性以查看具有流畅验证的模型

Need to expose HasError property from ValidationBaseClass to view Model with fluent validation

wpf

syncfusion

fluentvalidation

caliburn.micro

inotifydataerrorinfo

需要从 ValidationBaseClass 公开 HasError 属性 以查看具有流畅验证的模型

Need to expose HasError property from ValidationBaseClass to view Model with fluent validation

wpf

syncfusion

fluentvalidation

caliburn.micro

inotifydataerrorinfo

需要从 ValidationBaseClass 公开 HasError 属性以查看具有流畅验证的模型